Yes, it is replaceable and despite what the dealer will tell you, WITHOUT removing and replacing the windshield or rear window. Go here http://www.bimmerfest.com/forums/showthread.php?t=147492 for everything you want to know about it and more. The majority of the "how to" parts are within the first 3 pages. The "cover" costs about 30-40 dollars and if you are even semi-handy, takes less than an hour to remove the old one, clean up the MESS, and install the new one.